GRE Reading Comprehension: ETS-GRE阅读ETS - S8VON032L26548057

According to the passage, the size of the carbon tax levied on a given fuel would vary with the A. amount of that fuel used by a particular industry B. amount of pollution caused by the fuel being taxed C. size of the industries using the fuel being taxed D. effect that the tax would have on a country's economy E. number of users of a particular fuel at a particular time